github.com/sykesm/fabric@v1.1.0-preview.0.20200129034918-2aa12b1a0181/bccsp/utils/ecdsa_test.go (about)

     1  /*
     2  Copyright IBM Corp. All Rights Reserved.
     3  
     4  SPDX-License-Identifier: Apache-2.0
     5  */
     6  
     7  package utils
     8  
     9  import (
    10  	"crypto/ecdsa"
    11  	"crypto/elliptic"
    12  	"crypto/rand"
    13  	"math/big"
    14  	"testing"
    15  
    16  	"github.com/stretchr/testify/assert"
    17  )
    18  
    19  func TestUnmarshalECDSASignature(t *testing.T) {
    20  	_, _, err := UnmarshalECDSASignature(nil)
    21  	assert.Error(t, err)
    22  	assert.Contains(t, err.Error(), "failed unmashalling signature [")
    23  
    24  	_, _, err = UnmarshalECDSASignature([]byte{})
    25  	assert.Error(t, err)
    26  	assert.Contains(t, err.Error(), "failed unmashalling signature [")
    27  
    28  	_, _, err = UnmarshalECDSASignature([]byte{0})
    29  	assert.Error(t, err)
    30  	assert.Contains(t, err.Error(), "failed unmashalling signature [")
    31  
    32  	sigma, err := MarshalECDSASignature(big.NewInt(-1), big.NewInt(1))
    33  	assert.NoError(t, err)
    34  	_, _, err = UnmarshalECDSASignature(sigma)
    35  	assert.Error(t, err)
    36  	assert.Contains(t, err.Error(), "invalid signature, R must be larger than zero")
    37  
    38  	sigma, err = MarshalECDSASignature(big.NewInt(0), big.NewInt(1))
    39  	assert.NoError(t, err)
    40  	_, _, err = UnmarshalECDSASignature(sigma)
    41  	assert.Error(t, err)
    42  	assert.Contains(t, err.Error(), "invalid signature, R must be larger than zero")
    43  
    44  	sigma, err = MarshalECDSASignature(big.NewInt(1), big.NewInt(0))
    45  	assert.NoError(t, err)
    46  	_, _, err = UnmarshalECDSASignature(sigma)
    47  	assert.Error(t, err)
    48  	assert.Contains(t, err.Error(), "invalid signature, S must be larger than zero")
    49  
    50  	sigma, err = MarshalECDSASignature(big.NewInt(1), big.NewInt(-1))
    51  	assert.NoError(t, err)
    52  	_, _, err = UnmarshalECDSASignature(sigma)
    53  	assert.Error(t, err)
    54  	assert.Contains(t, err.Error(), "invalid signature, S must be larger than zero")
    55  
    56  	sigma, err = MarshalECDSASignature(big.NewInt(1), big.NewInt(1))
    57  	assert.NoError(t, err)
    58  	R, S, err := UnmarshalECDSASignature(sigma)
    59  	assert.NoError(t, err)
    60  	assert.Equal(t, big.NewInt(1), R)
    61  	assert.Equal(t, big.NewInt(1), S)
    62  }
    63  
    64  func TestIsLowS(t *testing.T) {
    65  	lowLevelKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
    66  	assert.NoError(t, err)
    67  
    68  	lowS, err := IsLowS(&lowLevelKey.PublicKey, big.NewInt(0))
    69  	assert.NoError(t, err)
    70  	assert.True(t, lowS)
    71  
    72  	s := new(big.Int)
    73  	s = s.Set(GetCurveHalfOrdersAt(elliptic.P256()))
    74  
    75  	lowS, err = IsLowS(&lowLevelKey.PublicKey, s)
    76  	assert.NoError(t, err)
    77  	assert.True(t, lowS)
    78  
    79  	s = s.Add(s, big.NewInt(1))
    80  	lowS, err = IsLowS(&lowLevelKey.PublicKey, s)
    81  	assert.NoError(t, err)
    82  	assert.False(t, lowS)
    83  	s, modified, err := ToLowS(&lowLevelKey.PublicKey, s)
    84  	assert.NoError(t, err)
    85  	assert.True(t, modified)
    86  	lowS, err = IsLowS(&lowLevelKey.PublicKey, s)
    87  	assert.NoError(t, err)
    88  	assert.True(t, lowS)
    89  }
    90  
    91  func TestSignatureToLowS(t *testing.T) {
    92  	lowLevelKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
    93  	assert.NoError(t, err)
    94  
    95  	s := new(big.Int)
    96  	s = s.Set(GetCurveHalfOrdersAt(elliptic.P256()))
    97  	s = s.Add(s, big.NewInt(1))
    98  
    99  	lowS, err := IsLowS(&lowLevelKey.PublicKey, s)
   100  	assert.NoError(t, err)
   101  	assert.False(t, lowS)
   102  	sigma, err := MarshalECDSASignature(big.NewInt(1), s)
   103  	assert.NoError(t, err)
   104  	sigma2, err := SignatureToLowS(&lowLevelKey.PublicKey, sigma)
   105  	assert.NoError(t, err)
   106  	_, s, err = UnmarshalECDSASignature(sigma2)
   107  	assert.NoError(t, err)
   108  	lowS, err = IsLowS(&lowLevelKey.PublicKey, s)
   109  	assert.NoError(t, err)
   110  	assert.True(t, lowS)
   111  }